gallon

n. unit of liquid capacity (equal to 3.78 liters)

There are three definitions in current use:U.S. liquid gallon is legally defined as 231 cubic inches, and is equal to 3.785411784 litres (exactly) or about 0.13368 cubic foot. This is the most common definition of a gallon in the USA. The U.S. fluid ounce is defined as 1/128 of a U.S. gallon.U.S. dry gallon is one-eighth of a U.S. Winchester bushel of 2150.42 cubic inches, thus 268.8025 cubic inches (exactly) or 4.40488377086 litres (exactly)Imperial (UK) gallon is legally defined as 4.54609 litres (~277.42 cu in), which is about 1.2 U.S. liquid gallons. This definition is used in the  United Kingdom, and is based on the volume of 10 pounds of water at 62 °F. (A U.S. liquid gallon weighs about 8.33 pounds at the same temperature.) The Imperial fluid ounce is defined as 1/160 of an Imperial gallon. The Imperial gallon is no longer legal, in the UK, for trade or public administration purposes, but it is used colloquially (and in advertising) for fuel consumption figures in miles per gallon. The Imperial gallon continues to be used as a unit of measure for fuel in various countries (for example, United Arab Emirates and Sierra Leone).
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Noun
1. United States liquid unit equal to 4 quarts or 3.785 liters
(synonym) gal
(hypernym) United States liquid unit
(part-holonym) barrel, bbl
(part-meronym) quart
2. a British imperial capacity measure (liquid or dry) equal to 4 quarts or 4.545 liters
(synonym) Imperial gallon, congius
(hypernym) British capacity unit, Imperial capacity unit
(part-holonym) bushel
(part-meronym) quart

n. gallon, unit of liquid capacity (equal to 3.78 liters)

adj. cocky, arrogant, conceited, vain (Mexico)

n. boss (Mexico)